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SDX...A Series
Precision compensated pressure sensors in DIP package
FEATURES
* 0...1 to 0...100 psi * DIP package * Temperature compensated * Calibrated zero and span * Small size * Low noise * High impedance for low power applications
GENERAL DESCRIPTION
The SDX series sensors will provide a very cost effective solution for pressure applications that require small size plus performance. These calibrated and temperature compensated sensors give an accurate and stable output over a 0 to 50C temperature range. SDX devices are available in standard commercial and prime grades to allow optimization of accuracy and cost in any given application. This series is intended for use with non-corrosive, non-ionic working fluids such as air, dry gases and the like. Devices are available to measure absolute and gage pressures from 1 up to 100 psi. The absolute devices have an internal vacuum reference and an output voltage proportional to absolute pressure. The output of the bridge is ratiometric to the supply voltage and operation from any D.C. supply voltage up to +20 V is acceptable. The SDX devices feature an integrated circuit sensor element and laser trimmed thick film ceramic housed in a compact solvent resistant case. The package is a double wide (i.e., 0.600" lead spacing) dual-inline-package. This is the same familiar package used by IC manufacturers except it is only 0.470" long and
Scale:
1 cm 1/2 inch
APPLICATIONS
* Medical equipment * Computer peripherals * Pneumatic controls * HVAC
has a pressure port(s). The PC board area used by each DIP is approximately 0.26 square inches. This extremely small size enables the use of multiple sensors in limited available space. The DIP provides excellent corrosion resistance and isolation to external package stress. The DIP mounts on a PC board like a standard IC with through-hole pins. The pins anchor the pressure sensor to the PC board and provide a more secure and stable unit than other types of packages.
EQUIVALENT CIRCUIT
ELECTRICAL CONNECTION
TOP VIEWS
Vs
+Vs
Pin 1 identified by chamfered corner P2 1 out + GND 4 out Vent hole
out GND out +
Pin 1 identified by chamfered corner 1 P1 +Vs 4
out + 1 GND out P1 P2 4 +Vs
SDX...G2-A
SDX...A2-A SDX...D4-A
+
Note: The polarity identicated is SDX...G2-A: P2 SDX...A2-A: P1 SDX...D4-A: P2
for pressure applied to (backward gage) (forward gage) (backward gage)
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SDX...A Series
Precision compensated pressure sensors in DIP package
PRESSURE SENSOR CHARACTERISTICS (all devices)
Maximum ratings
Supply voltage VS Maxium pressure on any port Lead temperature (soldering 4 sec.) +20 VDC 150 psig 250C
Environmental specifications
Temperature ranges Compensated Operating Storage Humidity limits 0 to 50C -40 to +85C -55 to +125C 0 to 100% RH
STANDARD PRESSURE RANGES
Part number
SDX01... SDX05... SDX15... SDX30... SDX100...
Operating pressure
0 - 1 psi 0 - 5 psi 0 - 15 psi 0 - 30 psi 0 - 100 psi
Proof11 pressure
20 psi 20 psi 30 psi 60 psi 150 psi
Min.
17.82 59.40 89.10 89.10 99.00 mV mV mV mV mV
Full scale span1,2 Typ.
18.0 mV 60.0 mV 90.0 mV 90.0 mV 100.0 mV
Max.
18.18 mV 60.60 mV 90.90 mV 90.90 mV 101.00 mV
COMMON PERFORMANCE CHARACTERISTICS1
Characteristics
Zero pressure offset Combined linearity and hysteresis3 Temperature effects (0 to 50C)4 Repeatability5 Input impedance6 Output impedance7 Common mode voltage8 Response time Long term stability of offset and span10
9
Min.
-0.300 Offset Span
Typ.
0 0.1 0.2 0.4 0.2 4.0 4.0 3.0 100 0.1
Max.
+0.300 0.25 0.5 1.0 0.5
Unit
mV %FSO mV %FSO k
1.5
5.0
V DC se c mV
Specification notes:
1. Reference conditions (unless otherwise noted): supply voltage, VS = 12VDC; TA = 25C; common mode line pressure = 0 psig; pressure applied to port 2. For absolute devices only, pressure is applied to port 1 and the output polarity is reversed. 2. Span is the algebraic difference between the output voltage at full scale pressure and the output at zero pressure. Span is ratiometric to the supply voltage. 3. Hysteresis is the maximum output difference at any point within the operating pressure range for increasing and decreasing pressure. Maximum linearity & hysteresis for the SDX05 is 0.5 %FSO. 4. Maximum error band of the offset voltage and the error band of the span, relative to the 25C reading. 5. Maximum difference in output at any pressure within the operating pressure range and temperature within 0 to +50C after: a) 100 temperature cycles, 0 to +50C. b) 1.0 million pressure cycles, 0 psi to full scale span. 6. Input impedance is the impedance between VS and ground. 7. Output impedance is the impedance between + and - outputs. 8. This is the common mode voltage of the output arms for VS = 12 VDC. 9. Response time for a 0 psi to full scale span pressure step change, 10 to 90 % rise time. 10. Long term stability over a one year period. 11. If the maximum pressure is exceeded, even momentarily, the package may leak or burst, or the pressure sensing die may fracture. The proof pressure for the forward gage of all devices in the D4-package is the specified value or 100 psi, whatever is less.
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SDX...A Series
Precision compensated pressure sensors in DIP package
PHYSICAL DIMENSIONS
SDX...G2-A, SDX...A2-A
0.470 (11.94)
0.550 (13.97)
0.105 (2.67)
0.315 (8.00) typ.
0.280 (7.11) typ.
compensation circuit 0.600 (15.24) typ. 0.01 (0.25)
0.190 (4.83) typ. 0.020 (0.51) typ. 0.100 (2.54) typ. 0.110 (2.79) typ.
mass: 2 g
dimensions in inches (mm)
SDX...D4-A
1 P1 4 P2 0.470 (11.94)
0.550 (13.97) O 0.090 (2.29) typ. 0.135 (3.43) 0.250 (6.35) 0.300 (7.62)
0.430 0.335 (10.92) typ. (8.50) typ.
compensation circuit 0.600 (15.24) typ.
0.120 (3.05) typ. 0.010 (0.25) typ.
0.020 (0.51) typ. 0.100 (2.54) typ.
0.110 (2.79) typ.
mass: 2 g
dimensions in inches (mm)
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SDX...A Series
Precision compensated pressure sensors in DIP package
GENERAL DISCUSSION
The SDX series devices give a voltage output which is directly proportional to applied pressure. The gage devices will give an increasing positive going output when increasing pressure is applied to the pressure port. The absolute device will give a decreasing output when increasing pressure is applied to the port. The devices are ratiometric to the supply voltage and changes in the supply voltage will cause proportional changes in the offset voltage and full-scale span.
USER CALIBRATION
The SDX devices are fully calibrated for offset and span and should therefore require little user adjustment in most applications. For more precise span and offset adjustments, contact the factory.
VACUUM REFERENCE (absolute devices)
Absolute sensors have a hermetically sealed vacuum reference chamber. The offset voltage on these units is therefore measured at vacuum, 0 psia. Since all pressure is measured relative to a vacuum reference, all changes in barometric pressure or changes in altitude will cause changes in the device output.
PNEUMATIC INTERFACE
The DIP also provides convenient mounting and pressure ports for ease of use with standard 1/16" ID, 1/8" OD, 1/32" wall, flexible plastic tubing for pressure connection. The small tubing has several advantages over larger tubing commonly used with pressure sensors: 1) The tubing can be formed in a much smaller radius without kinking. 2) The tubing is easier to handle. 3) The tubing is available in a variety of colors such as clear, white, yellow, blue, green etc. to enable color coding of pneumatic circuits with multiple pressure sensors in the same way that wiring harnesses are color coded in electrical circuits. This greatly simplifies troubleshooting. 4) Less stress is placed on the pressure sensor package resulting in less potential for offset shift. 5) Less physical space is required for the small tubing. 6) The lower volume of air in the small tubing results in faster pressure sensor response.
MEDIA COMPATIBILITY
SDX devices are compatible with most non-corrosive gases. Because the circuitry is coated with a protective silicon gel, many otherwise corrosive environments can be compatible with the sensors. Fluids must generally be compatible with silicon gel, plastic, RTV, silicon, and glass for use with the gage devices (only). For questions concerning media compatibility, contact the factory.
MECHANICAL AND MOUNTING CONSIDERATIONS
The DIP housing is designed for convenient pressure connection and easy PC board mounting. For pressure attachment, tygon and silicon tubing is recommended.
APPLICATION INFORMATION
The application information for the SCX series is also applicable to the SDX series.
ORDERING INFORMATION
Pressure range
0 - 1 p si 0 - 5 p si 0 - 1 5 p si 0 - 3 0 p si 0 - 1 0 0 p si SDX15A2-A SDX30A2-A SDX100A2-A
Absolute
Order number Gage
SDX01G2-A SDX05G2-A SDX15G2-A SDX30G2-A SDX100G2-A
Differential/Gage
SDX01D4-A SDX05D4-A SDX15D4-A SDX30D4-A SDX100D4-A
All devices are marked with SDX...A2 or SDX...G2 or SDX...D4 and a golden color dot.
SenSym and Sensortechnics reserve the right to make changes to any products herein. SenSym and Sensortechnics do not assume any liability arising out of the application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor the rights of others. June 2008 / 031 4/4
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